Corrosion Inhibitory properties of Biden pilosa Plant Extract on Mild Steel in Acidic Media

Abstract

A study on the inhibitive properties of Biden pilosa plant extracts on mild steel in 1.75 M HCl was embarked upon in this research using gasometric and potentiodynamic polarization technique at room temperature. The mild steel coupons were dipped in 1.75 M HCl blank and altered concentration of Biden pilosa plant extract (10%; 20%; 30%; 40% and 50% v/v). The rate of reaction between the acidic extract and the mild steel coupons gives the volume of hydrogen gas given off during the reaction. The observed inhibition efficiency using gasometric method indicated a direct relationship with upsurge in concentration of the inhibitors up to 50% concentration for Biden pilosa extracts. A comparable trend was observed in the Tafel plot using the polarization technique. The adsorption study revealed the use of Biden pilosa extract followed the Langmuir isotherm principles (chemisorption). The use of Biden pilosa extract is hereby proposed as good inhibitors for mild steel corrosion at 1.75 M HCl environment.